I have a 2014 TZ1 LXR Arctic Cat, and upgraded the stock shocks in the 144" rear skid. The front stock shocks on the LXR are Fox Zero Pro, but the rear are essentially junk. I replaced both rear shocks using Fox Zero Pro replacements. One was made custom length for the rear, as there are none made to fit the TZ1. I installed the new replacement, and it seemed very stiff. I could stand on the rear bumper with very little compression. When I would pump my weight up and down, there was full range of motion, but just way too tight. The front spring set just tight enough to compress the spring, and keep it from rattling. All the components properly reinstalled and torqued to specification. I contacted the shock expert that provided the replacement regarding the issue. He suggested I ride it for a season, and if I decided it was too tight he would revalve the shock. I put around a thousand miles on the machine last season, and decided to send it back to be revalved. I think it helped a little, but still almost no sag when I sit on the sled. I have considered replacing the torsion springs (I have the blocks on the softest setting), Okay so there are two holes on the idler arm (part number 9) that the front of the shock links (part number 28) connect too. You can see in the provided illustration that it shows the upper hole being used. I decided to try the lower hole but am unsure what imapct it had, or will have on the suspension. I suspect someone will be able to provide some insight on what looks like an adjustment. I am not sure what else to try here. Any suggestions would be great. Thanks!